Across
1
Smallest unit of an element
3
Center of an atom or cell
5
Path of a planet around the sun
7
Nerve cell in the brain
10
Disturbance that transfers energy
Down
2
Measure of matter in an object
4
Natural satellite of Earth
5
Compound containing oxygen
6
Absolute temperature scale unit
8
Basic unit of life
9
Reddish electrical conductor